PPP via AT command on nrf9151-DK doesn't work

Hi everybody,

I have problem with my nrf9151-DK. If I switch my kit do AT-Command mode (I use Serial Terminal of Nordic, v 1.4.3), I am not able to switch my kit to PPP mode. I tried some combination of mode selection (with LTE-M enabled, only NB-IOT enabled, both enabled) with AT%XSYSTEMMODE command. But if I used AT+CFUN=1 command as is shown in this example:

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/applications/serial_lte_modem/doc/PPP_AT_commands.html

I am not able switch my kit to PPP mode using AT#XPPP=1.

If i use AT#XPPP? command, I will get error. But why. It sounds like nrfd9151-DK doesn't know this AT command. If I do something wrong, i belive i will not be able to switch modem to PPP mode, but if i use AT#XPPP?, I could get regular answer. I belive if i will do something wrong with order of AT commands, I would get standard answer of AT#XPPP? command. I am able to connect kit to TCP server (connect it to APN).

Could somebody please show me how to work with PPP with nrf9151-DK (with AT commands). Order of command and syntax. I do what I see in example (without CMUX), but it doesn't work.

What I am doing wrong?

Parametrs of nrf9151-DK:

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> AT+CGMI
Nordic Semiconductor ASA
OK
> AT+CGMM
nRF9151-LACA
OK
> AT+CGMR
mfw_nrf91x1_2.0.1
OK
> AT+CGSN
359404230050685
OK
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Regards

Jaroslav Havel